HttpClient(4.3.5) - 简单示例

// 创建 HttpClient 实例
CloseableHttpClient httpClient = HttpClients.createDefault();
// 创建一个 HTTP GET 请求的实例
HttpGet httpGet = new HttpGet("http://www.example.com/");        
// 发送请求并获取 HTTP 响应
CloseableHttpResponse response = httpClient.execute(httpGet);

try {
    // 打印响应报文的起始行
    System.out.println(response.getStatusLine());
    
    // 打印响应报文的首部
    Header[] headers = response.getAllHeaders();
    for (Header header : headers) {
        System.out.println(header.getName() + ": " + header.getValue());
    }
    System.out.println("");
    
    // 打印报文的主体
    HttpEntity entity = response.getEntity();
    if (entity != null) {
        System.out.println(EntityUtils.toString(entity));
    }
} finally {
    response.close();
}